hi Ivan,
This is a simple plot of your results, it looks linear.

If you intend to measure via the HX711 module, you MUST set AVDD [ref my previous image] to the same voltage value as the E+/- Voltage.

Do you understand why.??
Ref Post #38 Do you understand what is meant by ratio metric regards an ADC.?

E

View attachment 270224

hi ericgibbs


Can you make a calculation formula from V load cell to the output of the hx711 module from the measurement results of each load that I attach?

Do you understand what is meant by ratio metric regards an ADC.?
I don't really understand about the ratio metric about ADC

 

hi Ivan,
We can only help with College assignments, we cannot do it for you.

What are the Voltages at these two points.?
E

 

hi Ivan,
We can only help with College assignments, we cannot do it for you.

What are the Voltages at these two points.?
E
View attachment 270225

hi ericgibbs,

blue font = voltage supplied from psu = 3.3 V
red font =I think it's the voltage to turn on the hx711?

thank you,

 

hi,
Please post a photo of the project so that I can see the wiring connections.
E

 

hi ericgibbs,

this is wiring connections my project

thank you

 

Hi
If your load cell and HX711 are wired as shown in that diagram, you cannot have 3.3V on the E+/-.
There is an onboard voltage regulator [ S8550] as shown in my images.

Looking at the LED wiring, how do you expect the LED's to work, with 3.3v on their Cathodes.???

The diagram pin numbers and wiring connections is not clear.

E
Please post a photo of the project

 

hi ericgibbs,

If your load cell and HX711 are wired as shown in that diagram, you cannot have 3.3V on the E+/-.
There is an onboard voltage regulator [ S8550] as shown in my images.
so ? what is the tension obtained from the picture?

Looking at the LED wiring, how do you expect the LED's to work, with 3.3v on their Cathodes.???
for the led circuit I used it wrong. because I use RGB LEDs have 4 legs

this my project.


thank you,


thank you

 

hi,
Look at this combined image.
The transistor in the Yellow rectangle is the voltage regulator, for the ADC and E+/- voltage, so if the input voltage to the HX711 is 3.3v the voltage on the E+/- cannot be 3.3v .

It will be approx 2.7V.
Measure it.

 

hi ericgibbs,

Okay, for red and black arrows? what is the voltage at the mark?
then the next step after getting it is there a calculation formula for the conversion from voltage to data?

thank you

 

hi,
Question for you.
If I had an 16 Bit A2D converter, where the MSbit was the SIGN Bit.

The A2D Vref was say 2.5V and the analogue input voltage to the A2D was say +1Volt, what would be the Hex value and Bit pattern value of the output of the A2D conversion.?

E

 

hi ericgibbs,
The A2D Vref was say 2.5V and the analogue input voltage to the A2D was say +1Volt, what would be the Hex value and Bit pattern value of the output of the A2D conversion.?
ADC = 1/((2^16)-1) = 1/65535 = 0.00001525902

Is this true ?

thank you

 

Is this true ?

Hi Ivan,
No.
May I ask which technical course are you studying.?
E

 

hi ericgibbs,
I didn't study it. I'm self-taught to find out. can you give me the next explanation that does ?

thank you

 

hi Ivan,
I have moved your Thread from the Homework Forum to the Analog & Digital Forum.
This means that we can offer more detailed technical help with your project.

Are you familiar with Hexadecimal and Binary notation of numeric values.?
E

 

hi Ivan,
I have moved your Thread from the Homework Forum to the Analog & Digital Forum.
This means that we can offer more detailed technical help with your project.

Are you familiar with Hexadecimal and Binary notation of numeric values.?
E

hi ericgibbs,
I know ,
binary is a number that only uses base 2 digits, namely 0 and 1.
Hexadecimal is a number that uses 16 symbols, starting from the numbers 0.1,2,3,4,5,6,7,8, and 9, then followed by the letters A,B,C,D,E, and F.

The A2D Vref was say 2.5V and the analogue input voltage to the A2D was say +1Volt, what would be the Hex value and Bit pattern value of the output of the A2D conversion.?
when will you tell me about the above method ?

thank you

 

Since your results show a linear relationship, a simple 2-point calibration would be ok.
You show voltage (mV) vs weight (g).
What we need is ADC (count) vs weight (g).

Do you know how to solve for the equation of a straight line?

The formula is written as
y = mx + c

or sometimes written as
y = a0 + a1.x

 

hi ericgibbs,
I know ,
binary is a number that only uses base 2 digits, namely 0 and 1.
Hexadecimal is a number that uses 16 symbols, starting from the numbers 0.1,2,3,4,5,6,7,8, and 9, then followed by the letters A,B,C,D,E, and F.

The A2D Vref was say 2.5V and the analogue input voltage to the A2D was say +1Volt, what would be the Hex value and Bit pattern value of the output of the A2D conversion.?
when will you tell me about the above method ?

thank you

I try think you are confusing number base with a number value.

First, with an input of 1V, what value would you expect on the output?

if the output is 0 for 0V and 1024 for 2.5V (for this example only. You may have different points), I’d expect 1V to be 410. This is all in decimal of course. You have two points. That’s all that’s necessary to determine a linear equation. That’s what I did to get 410

Now, you didn’t ask about decimal. You asked for binary or hexadecimal. 410 is 110011010 in binary or 19A in hexadecimal. I used an online calculator to make it easy.

Understand? This is no different than the others have been telling you.

 

Since your results show a linear relationship, a simple 2-point calibration would be ok.
You show voltage (mV) vs weight (g).
What we need is ADC (count) vs weight (g).

Do you know how to solve for the equation of a straight line?

The formula is written as
y = mx + c

or sometimes written as
y = a0 + a1.x

Hi MrChips,

Do you know how to solve equations of straight lines?
I do not understand about this, from your example one of the weights to find the ADC value obtained from the HX711 module?

thank you

 

I try think you are confusing number base with a number value.

First, with an input of 1V, what value would you expect on the output?

if the output is 0 for 0V and 1024 for 2.5V (for this example only. You may have different points), I’d expect 1V to be 410. This is all in decimal of course. You have two points. That’s all that’s necessary to determine a linear equation. That’s what I did to get 410

Now, you didn’t ask about decimal. You asked for binary or hexadecimal. 410 is 110011010 in binary or 19A in hexadecimal. I used an online calculator to make it easy.

Understand? This is no different than the others have been telling you.

Hi djsfantasi,

When you explain to me with one of the data that I get for example 500 grams = 0.55 mV. how to calculate to get value from hx711 module ?

Thank you

 

hi,
Measure with a Voltmeter the +/-E voltage, on the HX711 module, and post the value.
E